hyphenate-limit-chars (or -word): mixing 'auto' with integers

I am looking for clarifications on <http://dev.w3.org/cvsweb/~checkout~/csswg/css3-text/Overview.html?rev=1.181;content-type=text%2Fhtml#hyphenate-char-limits>:
What is the property name, hyphenate-limit-chars or hyphenate-limit-word?
When specifying a list of 2 or 3 values, must they all be integers (as the table suggests) or may there be a mixture of auto and integers (as the example suggests)?

Thanks!